The Others: How Animals Made Us Human (1996), Island Press, 1997, Part V, p. 173 https://books.google.it/books?id=dwq8BwAAQBAJ&pg=PA173.
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Paul Shepard: Frases en inglés
Thinking Animals: Animals and the Development of Human Intelligence (1978), University of Georgia Press, 1998, Chapter 1, p. 2 https://books.google.it/books?id=rSu9AQAAQBAJ&pg=PA2.